JPH06171344A - Control device for automotive air-conditioner - Google Patents

Abstract

PURPOSE:To enable local tuning so as to reduce the development manhours by dividing-parallelizing air-conditioning control into a first control block formed of blowoff air temperature control and blowoff port control, a second control block formed of air quantity control, and a third control block formed of intake port control. CONSTITUTION:An intake door actuator 5, a fan control circuit 8, an air mixing door actuator 15 and a mode door actuator 22 respectively conducting the control of an intake port, air quantity, blowoff air temperature and a blowoff port are connected to a control circuit 23. Air-conditioning control performed by the control circuit 23 is divided-parallelized into three control blocks, that is, a first control block formed of blowoff air temperature control and blowoff port control, a second control block formed of air quantity control, and a third control block formed of intake port control. Among the respective control blocks, parts influenced by the sequential causal relation are eliminated to the utmost so as to enable control by unit of the control block.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air conditioner for a motor vehicle, and in particular, enables local tuning to reduce development man-hours and realize optimum control.

[0002]

2. Description of the Related Art In recent air conditioners for automobiles, automatic air conditioners have been widely used for the purpose of improving safety. With this auto air conditioner, the occupant simply indicates the desired set temperature, and the temperature of the blowing air, the operation / stop of the compressor, the setting of the outlet mode, and the selection of the inside / outside air are automatically set so that the passenger compartment is always kept comfortable. And the air volume is switched. Such control is configured so that input signals from various sensors provided at a predetermined position of an automobile, an air conditioner, or the like are input to the control means, and the control means is operated in accordance with a predetermined determination standard. ing.

FIG. 3 shows an example of a conventional automatic air conditioner control. As for this control, as shown in the flowchart of the figure, all the controls are connected in series. That is, the control means first uses the temperature setter and various sensors (inside air sensor, outside air sensor, solar radiation sensor, suction temperature sensor) to respectively set the current temperature T _PTC , vehicle interior temperature T _INC , outside air temperature T _AMB , and solar radiation amount Q. Various data of _SUN and intake air temperature T _INT are input (step 1), and the target room temperature T _DINC is calculated according to a predetermined arithmetic expression based on these input data (step 2). Then, the S value is calculated according to the arithmetic expression S = AT _DINC + BT _INC + CQ _SUN- D ( _TPTC- T _INC ) + E- (FX + G) (82-T _INT ) + T _INT (1) (step 3). In the equation (1), A, B, C, D, E, F, and G are correction constants peculiar to the vehicle equipped with the air conditioner, and are predetermined values for each vehicle. Then, the opening degree of the air mix door for obtaining the blowout temperature is set so as to be within the range of S = ± 2 ° C. or less (step 4). Then, the control reference parameter Xm is calculated according to the arithmetic expression Xm = S + (FX + G) (82-T _INT ) + T _INT (2) (step 5). The Xm value corresponds to the target outlet temperature, and is a control parameter common to the outlet control, the inlet control, and the air volume control thereafter. When the Xm value is calculated in step 5,
The outlet mode, the intake mode, and the fan voltage are set according to the characteristics of the outlet mode, the intake mode, and the fan voltage with respect to the preset parameter Xm (steps 6 to 8).

[0004]

However, in such conventional control, the common reference control parameter Xm is used.
Since a series of air-conditioning control such as blow-out air temperature control, blow-out port control, suction port control, and air volume control is performed by A to G
When the value of the constant of is changed, the effect of this change of the constant will affect the entire area. For example, if you want to modify the characteristics of the blowout temperature, A
When the constants G to G are changed, the value of the reference control parameter Xm with respect to the input condition is changed, so that the characteristics of the other outlet control, the inlet control, and the air volume control are also affected.
Therefore, even if it is desired to correct only the characteristics of the outlet temperature, it is necessary to reconfirm the characteristics of the outlet control, the inlet control, and the air volume control over almost the entire temperature range. This is the same when modifying other control items. In this way, the reconfirmation items by tuning cover the entire range and the same confirmation man-hours as at the beginning of development are required.
Overall, the development man-hours increase.

Further, since the influence of tuning over the entire area means that there is a risk that the portion that has already been evaluated as good must be modified, even if the unfavorable portion is known. It is possible that no modifications will be made considering the impact on other parts. Therefore, as a result, the entire control area becomes the least common multiple, and there is a certain limit to the realization of optimum control for the whole by tuning.

The present invention has been made in view of the above problems of the prior art, and provides a control device for an automobile air conditioner capable of performing partial tuning while avoiding complication of a program. The purpose is to

[0007]

According to the present invention for achieving the above object, a control target for changing an air conditioning state in a vehicle compartment is grouped into a plurality of control blocks, and each control block belongs to the control block. It is characterized by comprising control means for setting control peculiar data necessary for control of the control object and independently controlling the control objects belonging to each of the control blocks on the basis of the control peculiar data.

[0008]

In the present invention thus constructed, the control device independently controls the control target belonging to the control block on a control block basis based on the control unique data unique to each control block. Therefore, the control blocks do not interfere with each other and
Only that part can be modified without affecting the other control blocks.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a control device for an automobile air conditioner according to an embodiment of the present invention, and FIG. 2 is a flow chart showing control according to the embodiment.

The main body of the automobile air conditioner shown in FIG. 1 is, like a general automobile air conditioner, an intake unit 1 that selectively takes in the inside air or the outside air, a cooling unit 2 that cools the intake air, and an intake unit. The heater unit 3 blows the conditioned air into the vehicle compartment after the temperature of the air is conditioned.

The intake unit 1 is rotatably provided with an intake door 4 for selecting the inside air or the outside air, and the intake door 4 is rotated by an intake door actuator 5 such as an electric actuator. The position of the intake door 4 is as follows: outside air mode for taking in only outside air, inside air mode for taking in only inside air, 5
It can be set to three positions in the semi-outside air mode including 0% inside air. Further, the intake unit 1 has a fan 7 rotated at a predetermined speed by a motor 6, and the amount of air blown into the vehicle compartment is adjusted by changing the rotation speed of the fan 7. The rotation speed of the fan 7 is changed by changing the voltage applied to the motor 6 by the fan control circuit 8.

The cooling unit 2 is internally provided with an evaporator 9 which constitutes a cooling cycle. By turning on the compressor 10 which also constitutes the cooling cycle, the refrigerant is supplied to the evaporator 9, and the intake air is cooled by heat exchange with the refrigerant.

A heater core 11 in which engine cooling water is circulated is internally provided in the heater unit 3, and a bypass 13 is formed near the heater core 11 so that intake air bypasses the heater core 11 and reaches the mixing chamber 12. Has been done.
An air mix door 14 is rotatably provided on the upstream side of the heater core 11 for adjusting the ratio of the amount of air passing through the heater core 11 to the amount of air passing through the bypass 13. This air mix door 14 is an air mix door actuator 1 such as an electric actuator.
It is rotated by 5. By changing the opening of the air mix door 14, the temperature of the air blown into the passenger compartment is adjusted. That is, in the mixing chamber 12 formed on the downstream side of the heater core 11, hot air that has passed through the heater core 11 and is heated by heat exchange with engine cooling water and unheated cold air that has passed through the bypass 13 are air. It will flow down at a ratio according to the opening degree of the mix door 14, and after the both are mixed and mixed at an appropriate temperature, the diff outlet 16 and the vent outlet 1 provided in the mixing chamber 12
The air is supplied to the vehicle compartment from any one of the air outlets 7 and the foot air outlet 18. Here, the differential air outlet 16 is an air outlet for guiding warm air to the inner surface of the windshield to remove fogging of the glass, and the vent outlet 17 blows conditioned air to the upper body of the occupant to control the temperature inside the room. The foot outlet 18 is an outlet for mainly guiding the warm air to the feet of the occupant to enhance the heating feeling of the occupant. These outlets 1
6 to 18 have a differential door 19 and a vent door 2 respectively.
0, a foot door 21 is rotatably provided, and is rotated by a mode door actuator 22 such as an electric actuator via a link mechanism. The outlet mode is, for example, a vent mode (VENT) that opens only the vent door 20, a foot mode (FOOT) that half-opens the foot door 21 and the differential door 19, and a bi-level mode (B / L that half-opens the vent door 20 and foot door 21 respectively). ) Consists of.

As described above, the intake door actuator 5, the fan control circuit 8, the air mix door actuator 15, the mode door actuator 22.
Respectively control intake port control, air volume control, blowout air temperature control, and blowout port control, and by controlling these outputs, the air conditioning state in the vehicle compartment is controlled to the optimum state. The controlled object is configured by the intake door actuator 5, the fan control circuit 8, the air mix door actuator 15, and the mode door actuator 22.

The intake door actuator 5, the fan control circuit 8, the air mix door actuator 15, and the mode door actuator 22 are connected to a control circuit 23 as a control means. The control circuit 23 further includes a temperature setter 24 that sets the temperature inside the vehicle, an inside air sensor 25 that detects the temperature inside the vehicle, and an outside air sensor 26 that detects the temperature outside the vehicle.
A solar radiation sensor 27 that detects the amount of solar radiation, and a suction temperature sensor 28 that detects the temperature of the intake air after passing through the evaporator 9.
Are connected respectively. In addition, the intake door actuator 5, the air mix door actuator 15,
The mode door actuators 22 are respectively provided with position detectors (not shown) for detecting the current door position or opening, and position signals from these position detectors are also input to the control circuit 23. Further, the compressor 10 is connected to the control circuit 23 via a magnet clutch (not shown).
Are connected. The control circuit 23 is composed of, for example, a microcomputer, and has switches 24 and sensors 25-2.
The input signal from 8 is arithmetically processed to comprehensively control the intake door actuator 5, the fan control circuit 8, the air mix door actuator 15, the mode door actuator 22, and the compressor 10.

Next, the contents of the air conditioning control by the control circuit 23 will be described with reference to the flowchart of FIG.
As shown in the figure, in this embodiment, as described above, the control that is conventionally connected to the control reference parameter Xm in series is divided into three control blocks and parallelized. That is, the air-conditioning control includes a first control block (N = 1) including blowout air temperature control and an outlet control, a second control block (N = 2) including airflow control, and a third control including intake port control. It is divided into three blocks (N = 3). As described below,
Between these control blocks, the part that is affected by the causal relationship before and after is eliminated as much as possible, and control in control block units and eventually independent tuning is possible.

Therefore, looking specifically at the contents of the flow, the control circuit 23 first shows that the temperature setting device 24 and various sensors (inside air sensor 25, outside air sensor 26, solar radiation sensor 27,
From the suction temperature sensor 28) to the current set temperature T
_PTC , vehicle interior temperature T _INC , outside air temperature T _AMB , solar radiation Q
Various data of _SUN and intake air temperature T _INT are input (step 10), and the target room temperature T _DINC is calculated based on these input data, for example, according to a fuzzy inference operation (step 11). Adjustment to the feeling of the occupant (hot or cold) is performed by the target room temperature T _DINC including the deviation correction described later. Then, the deviation Δt between the target room temperature T _DINC calculated in step 11 and the room temperature T _INC detected by the inside air sensor 25 in step 10 is calculated (step 12). Then, after resetting the number N of the control block to be controlled to 1 (step 1
3) The value of the control target block number N is judged (step 14).

When the first control block (N = 1) is selected as a result of this determination, the rotating direction of the air mix door 14 is determined based on the deviation Δt in order to control the temperature of the blown air (step 15). ). The control direction at this time is the direction to open the air mix door 14 (“UP”).
, Close direction (“DOWN”), stop (“HOL”)
D ”) is set. As a result, the blowout temperature changes arbitrarily. Then, the differential value (change speed) of the deviation Δt is calculated, and the rotation speed of the air mix door 14 is determined based on this differential value (step 1
6). For example, during a transition with a large differential value, the speed is increased so that it can rotate in a short time, and when the differential value is stable, the speed is reduced to make it difficult to change. This is expected to achieve both stability and responsiveness. Preferably, the arithmetic processes of steps 15 and 16 are performed by fuzzy inference. In this way, the control of the blowing air temperature is performed by controlling the target room temperature T
_Since it is the deviation control between _DINC and the room temperature T _INC, and the blown air temperature follows the room temperature balance, no correction is necessary. Then, the outlet temperature Xf is calculated according to a predetermined arithmetic expression based on the current position of the air mix door 14 and the intake air temperature T _INT (step 17).

Then, based on the outlet temperature Xf calculated in step 17, the outlet mode is selected according to preset outlet characteristics (step 1).
8). It is preferable that the air outlet control is also performed by fuzzy inference calculation.

Then, the control circuit 23 increments the value of the control target block number N by 1 (step 24) and determines whether the value of the control target block number N is larger than 3 (step 25). As a result of this determination, if the value of the control target block number N is larger than 3, the process proceeds to step 26 described later, and if not, the process returns to step 14. In this case, N = 2, and the process returns to step 14.

When the second control block (N = 2) is selected as a result of the determination in step 14, the control circuit 23 controls the fan air volume based on the deviation Δt and the outside air temperature T _AMB , for example. The fan voltage is set by fuzzy inference calculation (step 19). At this time, an ideal voltage setting is made with respect to the outside air temperature T _AMB . Then, the differential value (rate of change) of the deviation Δt is calculated,
The fan voltage is corrected based on this differential value (step 20). For example, during a transition with a large differential value, the fan temperature is set to the HI side and the vehicle interior temperature is set to the target room temperature T in the shortest time.
_Try to reach _DINC . In this fan control, the maximum performance of heating and cooling is matched.

Then, the process proceeds to step 24 and step 25 described above, and in this case N = 3, so the process returns to step 14.

When the third control block (N = 3) is selected as a result of the determination in step 14, the heat load of the vehicle is determined based on the vehicle interior temperature T _INC , the outside air temperature T _AMB, and the solar radiation amount Q _SUN. Xi is predicted (step 21), and the intake mode is selected based on the vehicle heat load Xi according to the preset inlet characteristic (step 2).
2). It is preferable that the suction port control in steps 21 and 22 is also based on fuzzy inference. Then, the differential value (change speed) of the vehicle interior temperature T _INC is calculated,
The position of the intake door 4 is corrected based on this differential value (step 23). For example, the intake door 4 is set to the outside air when the differential value is small and stable, and is set to the internal air when the cooldown is large. This is expected to achieve both maximum performance and comfort.

Then, the process proceeds to the above-mentioned steps 24 and 25, and in this case N = 4, so the process proceeds to the next step 26.

In this step, on / off control of the compressor 10 is performed based on the outside air temperature T _AMB in order to prevent freezing of the evaporator 9 and protect the compressor 10, following the control of the above-mentioned three control blocks. (Step 26).

Then, the control circuit 23 repeatedly executes the above processing at a predetermined time.

As described above, in the present embodiment, the air conditioning control is divided into three control blocks in parallel (a first control block consisting of blown air temperature control and an outlet control, a second control block consisting of air volume control, The third control block including suction port control) and each control block are controlled independently, and at that time, mutual interference between the control blocks is suppressed as much as possible. That is, as described above, the first
As a point, fit to the feeling (hot or cold)
Is performed at the target room temperature T _DINC . Secondly, regarding vehicle adaptation due to the difference in heat load, the blowout temperature is deviation control and no correction is required, and the intake setting is consistent with the cooldown performance. In addition, the fan control is supported by matching the maximum performance of heating and cooling. Further, in the present embodiment, as a third point, regarding the difference in temperature control caused by the difference in the heater unit 3, the blowout temperature estimation formula is corrected for setting the mode switching point, and the temperature difference between the upper and lower units is taken into consideration. This is dealt with by changing the mode switching point. Therefore, since there is little interaction between these first to third points,
It becomes possible to modify or tune each control block without affecting other parts. Therefore, in the correction process, it becomes possible to deal with local tuning and partial evaluation, and the number of reconfirmation items after correction is reduced compared to the conventional method, which reduces the development man-hours as a whole. Become. In addition, as described above, partial tuning for each control block is possible and mutual interference with other parts is small, so only the defective part is corrected without modifying the part that has already received good evaluation. It becomes possible to tune the entire control in the direction of optimization. In this regard, the adoption of fuzzy control enables even finer tuning.

In this embodiment, the fuzzy inference is used in the air-conditioning control such as the blow-out air temperature control, the blow-out port control, the air flow rate control, and the suction port control, but the present invention is not limited to this. .

Further, in the present embodiment, the air conditioning control is divided into three control blocks, but the present invention is not limited to this, and more complicated air conditioning control (for example, front and rear seat independent temperature control type or left and right independent temperature control). It is also possible to appropriately divide into four or more control blocks in a vehicle air conditioner that performs a mold or the like).

Further, in this embodiment, in the series of controls, the first control block including the blown air temperature control and the outlet control, the second control block including the air volume control, and the third control block including the suction port control. Are controlled in this order, but the control order of each control block is not limited to this and may be set arbitrarily.

[0031]

As described above, according to the present invention, it is possible to perform local tuning for each control block, and it is possible to reduce development man-hours and realize optimum control.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a control device for an automobile air conditioner according to an embodiment of the present invention.

FIG. 2 is a flowchart showing control according to the same embodiment.

FIG. 3 is a flowchart showing an example of conventional air conditioning control.

[Explanation of symbols]

 5 ... Intake door actuator (control target) 8 ... Fan control circuit (control target) 15 ... Air mix door actuator (control target) 22 ... Mode door actuator (control target) 23 ... Control circuit (control means)

Claims (1)

[Claims] 1. A control target for changing an air conditioning state in a vehicle interior
Group (5,8,15,22) into multiple control blocks and set the control-specific data required for controlling the control target (5,8,15,22) belonging to each control block. However, for a vehicle characterized by having a control means (23) for independently controlling the controlled objects (5, 8, 15, 22) belonging to each of the control blocks based on the control-specific data in units of the control blocks (23) Air conditioner control device.